PR/FixPointCloud4MSVC

[AlexMWells]

Fixes Issue #1755: Build error on MSVC with Partio

Description

Explicitly mark unsupport/unused PointCloud copy/move constuctors and assignment operators as deleted. Change SortedPointRecord indice type from int to uint32_t and add static_cast during construction to avoid a warning.

Tests

Existing testsuite covers changes

Checklist:

• [x] I have read the contribution guidelines.
• [x] I have updated the documentation, if applicable.
• [x] I have ensured that the change is tested somewhere in the testsuite (adding new test cases if necessary).
• [x] My code follows the prevailing code style of this project. If I haven't already run clang-format before submitting, I definitely will look at the CI test that runs clang-format and fix anything that it highlights as being nonconforming.

[AlexMWells]

@lgritz , I think this PR is ready to go up (and low risk)